1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/mach-spear13XX/headsmp.S
4 *
5 * Picked from realview
6 * Copyright (c) 2012 ST Microelectronics Limited
7 * Shiraz Hashim <shiraz.linux.kernel@gmail.com>
8 */
9
10#include <linux/linkage.h>
11#include <linux/init.h>
12
13	__INIT
14
15/*
16 * spear13xx specific entry point for secondary CPUs. This provides
17 * a "holding pen" into which all secondary cores are held until we're
18 * ready for them to initialise.
19 */
20ENTRY(spear13xx_secondary_startup)
21	mrc	p15, 0, r0, c0, c0, 5
22	and	r0, r0, #15
23	adr	r4, 1f
24	ldmia	r4, {r5, r6}
25	sub	r4, r4, r5
26	add	r6, r6, r4
27pen:	ldr	r7, [r6]
28	cmp	r7, r0
29	bne	pen
30
31	/* re-enable coherency */
32	mrc	p15, 0, r0, c1, c0, 1
33	orr	r0, r0, #(1 << 6) | (1 << 0)
34	mcr	p15, 0, r0, c1, c0, 1
35	/*
36	 * we've been released from the holding pen: secondary_stack
37	 * should now contain the SVC stack for this core
38	 */
39	b	secondary_startup
40
41	.align
421:	.long	.
43	.long	spear_pen_release
44ENDPROC(spear13xx_secondary_startup)
45